Seminar khoa học của PGS.TS Bùi Xuân Vương và PGS.TS Lã Đức Dương

Vào 14h00, ngày 7/03/2025 Viện IAST tổ chức buổi trao đổi học thuật tại Phòng họp B với nội dung chi tiết như sau: 

PGS.TS Bùi Xuân Vương trình bày về "Adsorption of crystal violet dye by biochar made from coffee ground"

Tóm tắt:

Biochar was prepared by anaerobic heating coffee ground at 800oC for 3 hours. The prepared sample was used to adsorb crystal violet dye in an aqueous environment. The result showed that the biochar sample had good adsorption capacity for crystal violet dye, with a maximum adsorption capacity of 128.87 (mg/g). Response surface methodology (RSM) was also used to optimize the removal of crystal violet in an aqueous environment. ANOVA analysis showed that the model was statistically significant with a high R2 value and P < 0.0001. The model testing results showed that removing crystal violet was highly effective. Thus, low-cost biochar prepared from coffee grounds has great potential as an adsorbent material to remove crystal violet dye in an aqueous environment.

PGS.TS Lã Đức Dương trình bày về "Innovative approaches on anode materials (spherical graphite and aluminum) for lithium-ion batteries"

Tóm tắt:

 Lithium-ion batteries (LIBs) are the cornerstone of modern energy storage, powering everything from consumer electronics to electric vehicles. While graphite has been the dominant anode material due to its stability and cycle life, its limited theoretical capacity (~372 mAh/g) presents challenges for next-generation high-energy-density applications. To overcome these limitations, researchers are exploring silicon (Si) and aluminum (Al) as alternative anode materials due to their significantly higher theoretical capacities (~4200 mAh/g for Si and ~990 mAh/g for Al). Silicon, despite its exceptional capacity, suffers from large volume expansion (~300%) during lithiation, leading to structural degradation and capacity fading. Various strategies, including nanostructuring, composite formation, and binder modifications, have been developed to mitigate these effects. Aluminum, with its higher electrical conductivity and lower cost, is also being investigated as a promising anode material. Recent advancements in alloying behavior, structural optimization, and composite engineering have improved the stability and cycle performance of both materials. This review discusses the challenges and breakthroughs in transitioning from graphite to silicon and aluminum anodes, highlighting key innovations in material design and battery performance enhancement. The development of these next-generation anodes will play a crucial role in meeting the growing demands for high-performance energy storage solutions